Description:Dahlia Show Dates: Sat, Sep 27 - Sun, Sep 28View all dates and times Location Phone: 404.876.5859Location URL:www.atlantabotanicalgarden.orgBlue ribbon Dahlias of every size and color, from pompoms to dinner-plates and from white to purple-black, fill Mershon Hall. After the Dahlia Show ends, approximately 500 blooms will be given out to Garden visitors, free.